Temperature control device and control method of battery unit and energy storage container

Abstract

The invention provides a temperature control device and control method of a battery unit and an energy storage container, the temperature control device comprises an immersion shell, the immersion shell comprises a battery part and an inclined body part, the inner side of the battery part is provided with a first chamber, the inner side of the inclined body part is provided with a second chamber, and the second chamber is communicated with the first chamber; the battery unit is arranged in the first cavity; the immersion liquid is arranged in the first chamber and the second chamber; the cross section of the phase-change shell is triangular, an upper inclined plate of the phase-change shell is attached to a lower plate of the inclined body part, and a phase-change material is arranged in the phase-change shell; and the condensing device is arranged on one side, far away from the battery part, of the inclined body part and is used for cooling and condensing the evaporated immersion liquid and / or cooling the phase change material. Through the arrangement of the inclined body part on the immersion shell, the amount of immersion liquid is increased, the flowing efficiency of gas after the immersion liquid is evaporated is improved, a supplementary cold source is provided for the immersion liquid in the immersion shell through the arrangement of the phase change shell and the phase change material in the phase change shell, and the temperature control cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of charging equipment, and in particular to a temperature control device and a control method for a battery unit and an energy storage container. Background Art

[0002] Under the background of the development of new energy industry, the battery energy storage of clean energy is becoming more and more mature. Containers composed of battery system, energy conversion system, cooling system, control system, fire protection system and auxiliary system have also been widely used as energy storage. Energy storage containers have high energy density, easy installation, convenient transportation and high integration, which can meet the needs of different industries and working environments.

[0003] Since a large number of energy storage devices such as battery modules are integrated in the energy storage container, the heat generated during operation is relatively large, resulting in high requirements for the heat dissipation performance of the energy storage container. Energy storage containers in the prior art usually use air cooling or liquid cooling plates to control the temperature of the battery modules. However, due to the influence of the sealing of the energy storage container and the location of the battery modules and cooling devices, the temperature distribution inside the container is often uneven, and it is impossible to ensure that all battery modules are at the ideal operating temperature. When the temperature of the battery module is too high, there is a risk of fire caused by thermal runaway. Summary of the invention

[0004] The problem to be solved by the present invention is that, in the prior art, due to the influence of the sealing of the energy storage container and the location of the battery module and the cooling device, the temperature distribution inside the container is often uneven, and it is impossible to ensure that all battery modules are at an ideal operating temperature. When the temperature of the battery module is too high, there is a risk of fire caused by thermal runaway.

[0005] In order to solve the above problems, the present invention discloses a temperature control device for a battery unit, wherein the battery unit is used for an energy storage container, comprising:

[0006] An immersion shell includes a battery portion and an oblique body portion, wherein a first chamber is disposed inside the battery portion, the oblique body portion is disposed on one side of the battery portion, the oblique body portion gradually tilts upward in a direction away from the battery portion, a second chamber is disposed inside the oblique body portion, and the second chamber is communicated with the first chamber;

[0007] A battery unit is disposed in the first chamber;

[0008] An immersion liquid is disposed in the first chamber and the second chamber, wherein the immersion liquid at least immerses half of the battery cell in a height direction;

[0009] A phase change shell, wherein the cross section of the phase change shell is triangular, an upper inclined plate of the phase change shell is arranged in close contact with a lower plate of the inclined body, and a phase change material is arranged in the phase change shell;

[0010] The condensing device is arranged on a side of the oblique body away from the battery part. The condensing device is arranged in close contact with the oblique body and the phase change shell, and is used to cool and condense the evaporated immersion liquid and / or cool the phase change material.

[0011] On the one hand, the first cavity can accommodate more immersion liquid when the battery cells are placed, and the boiling time of the immersion liquid can be delayed by setting the phase change material, thereby significantly improving the temperature control ability of the immersion liquid and reducing the number and time of starting the refrigeration device. Under the condition of ensuring the operating temperature of the battery cells, the cost of temperature control can be effectively saved; on the other hand, the evaporation and condensation cycle speed of the immersion liquid can be increased, and the condensation efficiency of the condensation device can be improved.

[0012] Furthermore, the condensing device includes a main line, a second branch is arranged at a position corresponding to the main line and each immersion shell, the second branch is connected to the main line after passing through the phase change shell, and a second valve body is arranged on each second branch.

[0013] In this arrangement, the second branch passes through the phase change shell, so that the heat exchange area between the condensate in the condensing device and the phase change material is larger, and heat exchange can be performed more effectively to better maintain the temperature of the immersion liquid, thereby controlling the operating temperature of the battery unit.

[0014] Furthermore, the second branch includes a liquid inlet pipe, a liquid outlet pipe and a phase change inner coil, the second valve body is arranged on the liquid inlet pipe, and the phase change inner coil is arranged inside the phase change shell.

[0015] The phase-change inner coil is a coil structure. Through the above arrangement, the heat exchange area between the second branch and the phase-change material can be significantly increased, thereby improving the heat exchange effect.

[0016] Furthermore, the phase change inner coil is arranged at a position close to the upper inclined plate of the phase change shell.

[0017] This arrangement enables the phase change inner coil to cool and exchange heat with the immersion liquid and the phase change material at the same time, thereby significantly improving its refrigeration capacity.

[0018] Furthermore, a first branch is provided at a position corresponding to the main line and each immersion shell, a main line valve body is provided at a position corresponding to each first branch on the main line, and a first valve body is provided on each first branch.

[0019] Through the above arrangement, the condensing device can selectively cool the immersion shell and / or the phase change shell, thereby saving temperature control costs.

[0020] Furthermore, a water collecting device is provided on the upper side of the oblique body portion or the oblique body portion and the battery portion, and the water collecting device is used to collect condensed water on the condensing device and make the condensed water flow at least over the upper surface of the oblique body portion.

[0021] By setting up the water collecting device, the condensed water flows through the upper surface of the inclined body. Since the upper plate of the inclined body is inclined, the steam generated inside the immersion shell rises along the inner surface of the upper plate of the inclined body, so that the upper plate of the inclined body becomes a heat exchange structure between the condensed water and the steam of the immersion liquid, so that the condensed water is used to cool the steam. On the one hand, the refrigeration capacity is fully utilized and the refrigeration efficiency is improved. On the other hand, the condensation capacity is increased and the condensation efficiency of the immersion liquid is improved.

[0022] Furthermore, the melting point M of the phase change material is lower than the boiling point T of the immersion liquid.

[0023] During the melting process of the phase change material, it is in a state of solid-liquid mixture, and the temperature is fixed at its melting point. Since the cross-section of the phase change shell is triangular, part of the liquid after the phase change material is melted is always in contact with the upper inclined plate, so that it can always maintain a heat exchange state with the immersion liquid, thereby effectively delaying its boiling time.

[0024] Furthermore, the boiling point T of the immersion liquid is between 30°C and 40°C, and the melting point of the phase change material is between 25°C and 35°C.

[0025] Limiting the boiling point of the immersion liquid to 30°C to 40°C allows it to continue evaporating during battery operation, and even if it boils, it remains at a relatively reasonable temperature, which can effectively avoid thermal runaway of the battery and ensure its operating safety. Setting the melting point of the phase change material between 25°C and 35°C allows it to significantly delay the boiling time of the immersion liquid, thereby saving refrigeration energy consumption.

[0026] The present invention also discloses a temperature control method, which is used for the temperature control device as described above, and is characterized in that the control method comprises:

[0027] Step S1: Detect the temperature T of all battery cells in the energy storage container i ;

[0028] Step S2: Set T i Respectively with the first preset temperature T 1 Compare, when there is more than one T i >T 1 When the refrigeration device in the energy storage container is started to provide condensate to the condensing device;

[0029] Step S3: According to T i With the first preset temperature T 1 The comparison result is that when Ti >T 1 When T i ≤T 1 When , execute step S9;

[0030] Step S4: Set T i and the second preset temperature T 2 Compare, when T i >T 2 When T i ≤T 2 When the corresponding battery unit and / or immersion shell is recorded as the second cooling group, step S7 is executed;

[0031] Step S5: Open the main valve body and the second valve body corresponding to the battery unit and / or the immersion shell in the first cooling group, close the first valve body, and then execute step S6;

[0032] Step S6: Real-time monitoring of the temperature of the battery cells in each immersed shell in the first cooling group, when the temperature drops to T 1 When the temperature reaches 0, it is recorded in the second cooling group and step S7 is executed;

[0033] Step S7: Open the main valve bodies corresponding to the battery cells and / or the submerged shell in the second cooling group, close the first valve body and the second valve body, and then execute step S8;

[0034] Step S8: Real-time monitoring of the temperature of the battery cells in each immersion shell in the second cooling group. When the temperature drops to the boiling point T of the immersion liquid, it is recorded in the third cooling group and step S10 is executed; when the temperature rises to T 2 When the temperature reaches 0, it is recorded in the first cooling group and step S5 is executed;

[0035] Step S9: Set T i Compared with the boiling point temperature T of the immersion liquid, when T i >T, the corresponding battery unit and / or immersion shell is recorded as the third cooling group, and step S10 is executed. i ≤T, the corresponding battery unit and / or immersion shell is recorded as a non-cooling group, and step S12 is executed;

[0036] Step S10: Open the second valve body corresponding to the battery unit and / or the immersion shell in the third cooling group, close the main valve body and the first valve body, and then execute step S11;

[0037] Step S11: Real-time monitoring of the temperature of the battery cells in each submerged shell in the third cooling group, when the temperature drops to the third preset temperature T 3When the temperature rises to the first preset temperature T 1 When the temperature reaches 0, it is recorded in the second cooling group and step S8 is executed;

[0038] Step S12: opening the first valve bodies corresponding to the battery cells and / or the submerged shells in the non-cooling group, closing the main valve body and the second valve body, and then executing step S13;

[0039] Step S13: monitor the temperature of the battery cells in each immersion shell in the third cooling group in real time. When the temperature reaches the boiling point T of the immersion liquid, record it in the third cooling group and execute step S10;

[0040] Wherein, i is the number of the battery unit and / or the immersion shell in the energy storage container, and the first preset temperature T 1 , the second preset temperature T 2 and the third preset temperature T 3 is the preset value, T 2 >T 1 >T>T 3 .

[0041] Through the above settings, hierarchical control of battery temperature is achieved. Since the switching temperatures of heating and cooling of each cooling group are different, frequent switching of valve bodies is avoided, thereby ensuring the operational stability of the system.

[0042] The present invention also discloses an energy storage container, comprising the temperature control device as described above.

[0043] Compared with the prior art, the temperature control device, control method and energy storage container of a battery unit described in the present invention have the following advantages:

[0044] The present invention realizes the immersion cooling of the battery unit by setting the immersion liquid in the immersion shell, so that the battery unit is within a suitable operating temperature range. By setting the oblique body on the immersion shell, on the one hand, the amount of immersion liquid is increased, and the stability of immersion cooling is improved. On the other hand, the flow efficiency of the gas after the immersion liquid evaporates is improved, so that it can be condensed by the condensation device to form liquid faster and gather to the battery part, pushing up the liquid level in the battery part to maintain the stability of the battery unit temperature. The setting of the water collecting device on the oblique body facilitates the collection of condensed water on the one hand, and can also make the condensed water and the gas after the immersion liquid evaporate to exchange heat, so as to effectively utilize the cold contained in the condensed water, effectively reduce energy consumption, and improve temperature control efficiency. The phase change shell and the phase change material therein provide a supplementary cold source for the immersion liquid in the immersion shell, which can effectively delay the start time of the refrigeration device and reduce the temperature control cost. The present invention has a simple structure, ensures that the battery units are in a stable temperature state by immersion, effectively prevents thermal runaway, improves the operation safety of the energy storage container, and saves temperature control costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a front view of the energy storage container according to an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the three-dimensional structure of the temperature control device according to an embodiment of the present invention arranged on a rack;

[0047] Figure 3 for Figure 2 A partial enlarged schematic diagram of the middle C area;

[0048] Figure 4 It is a schematic diagram of the three-dimensional structure of the temperature control device according to an embodiment of the present invention;

[0049] Figure 5 A top view of a temperature control device according to an embodiment of the present invention;

[0050] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the AA part;

[0051] Figure 7 for Figure 5 A partial enlarged schematic diagram of the B part;

[0052] Figure 8 Schematic diagram of the piping structure of the condensing device in an embodiment of the present invention.

[0053] Description of reference numerals:

[0054] 100, housing; 200, rack; 210, support plate; 300, refrigeration device; 400, immersion shell; 410, battery part; 420, oblique body; 421, side baffle; 422, baffle rib; 423, lower baffle; 424, sump; 425, drain hole; 430, immersion liquid; 500, condensing device; 510, main line; 511, main line valve body; 520, first branch; 521, first valve body; 530, second branch; 531, liquid inlet pipe; 532, liquid outlet pipe; 533, phase change inner coil; 534, second valve body; 600, battery unit; 700, phase change shell; 710, phase change material. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0056] A temperature control device, a control method and an energy storage container for a battery unit according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] Example 1

[0058] This embodiment provides a temperature control device for a battery unit, wherein the battery unit 600 is used in an energy storage container. Figure 1-Figure 8 As shown, including:

[0059] The immersion shell 400 includes a battery portion 410 and an oblique portion 420, wherein a first chamber is disposed inside the battery portion 410, the oblique portion 420 is disposed on one side of the battery portion 410, the oblique portion 420 gradually tilts upward in a direction away from the battery portion 410, and a second chamber is disposed inside the oblique portion 420, the second chamber being communicated with the first chamber;

[0060] A battery unit 600 is disposed in the first chamber;

[0061] An immersion liquid 430 is disposed in the first chamber and the second chamber, and the immersion liquid 430 immerses at least half of the battery unit 600 in a height direction;

[0062] A phase change housing 700, wherein the cross section of the phase change housing 700 is triangular, wherein an upper inclined plate thereof is arranged in contact with a lower plate of the oblique body portion 420, and a phase change material 710 is arranged in the phase change housing 700;

[0063] The condensation device 500 is disposed on a side of the oblique body 420 away from the battery portion 410 . The condensation device 500 is disposed in close contact with the oblique body 420 and the phase change housing 700 , and is used to cool and condense the evaporated immersion liquid 430 and / or cool the phase change material 710 .

[0064] In the above device, the immersion liquid 430 gradually evaporates during the operation of the battery, and absorbs a large amount of heat during evaporation, thereby absorbing the heat generated by the battery cell 600 during operation and keeping it at a stable temperature. The arrangement of the oblique body 420 allows the steam formed by the immersion liquid 430 absorbing the heat from the battery cell 600 and evaporating to rise rapidly along the inner surface of the upper plate of the oblique body 420 (such as Figure 5 After condensation, it quickly falls down along the inner wall of the position where the bevel portion 420 and the condensation device 500 are attached. After condensation, it quickly falls down along the inner wall of the position where the bevel portion 420 and the condensation device 500 are attached. When the lower plate part is exposed from the liquid surface, the condensed immersion liquid 430 is gathered along the downwardly inclined lower plate toward the direction of the battery portion 410. Compared with the setting in which the condensation structure is set at the top and the droplets of steam condensed at the top are gathered and dripped by themselves, it does not need to wait for the droplets to gather and drip, and can be replenished into the liquid immersion liquid 430 more quickly, thereby significantly increasing the circulation speed of the immersion liquid 430 after evaporation, which helps to maintain the liquid level of the immersion liquid 430 in the immersion shell 400, thereby more effectively ensuring that the battery cell 600 is at a suitable operating temperature. In addition, the phase change shell 700 is fitted with the lower plate of the oblique body 420 and the phase change material 710 is arranged inside it, so that the fitting part of the two forms a corresponding heat exchange structure. When the temperature is greater than the melting point of the phase change material 710, it begins to melt. Since the temperature of the solid-liquid mixture does not change when the material changes from solid to liquid, and a large amount of heat is absorbed from the immersion liquid 430, the phase change material 710 provides a large amount of supplementary cooling for the immersion liquid 430, further delaying the start-up time of the refrigeration device 300 in the energy storage container and saving the energy consumption of the temperature control device. Through the above arrangement, on the one hand, the first cavity can accommodate more immersion liquid 430 when the battery unit 600 is placed, and the boiling time of the immersion liquid 430 is delayed by the arrangement of the phase change material 710, thereby significantly improving the temperature control ability of the immersion liquid 430, reducing the number and time of opening the refrigeration device 300, and effectively saving the cost of temperature control while ensuring the operating temperature of the battery unit 600; on the other hand, it can increase the evaporation and condensation cycle speed of the immersion liquid 430 and improve the condensation efficiency of the condensation device 500. It should be noted that the battery unit 600 can be a battery monomer or a battery module.

[0065] As one of the preferred embodiments, the condensing device 500 includes a main line 510, a second branch line 530 is arranged at a position corresponding to the main line 510 and each immersion shell 400, the second branch line 530 passes through the phase change shell 700 and is connected to the main line 510, and a second valve body 534 is arranged on each second branch line 530. In this configuration, the second branch line 530 passes through the phase change shell 700, so that the heat exchange area between the condensate in the condensing device 500 and the phase change material 710 is larger, and heat exchange can be performed more effectively, so as to better maintain the temperature of the immersion liquid 430, thereby controlling the operating temperature of the battery unit 600.

[0066] In this embodiment, the second branch 530 includes a liquid inlet pipe 531, a liquid outlet pipe 532 and a phase change inner coil 533, the second valve body 534 is arranged on the liquid inlet pipe 531, and the phase change inner coil 533 is arranged inside the phase change housing 700. The phase change inner coil 533 is a coil structure, and through the above arrangement, the heat exchange area between the second branch 530 and the phase change material 710 can be significantly increased, thereby improving the heat exchange effect.

[0067] As a preferred embodiment, the phase change inner coil 533 is arranged near the upper inclined plate of the phase change housing 700. Preferably, the phase change inner coil 533 is arranged in close contact with the upper inclined plate, which enables the phase change inner coil 533 to cool and exchange heat with the immersion liquid 430 and the phase change material 710 at the same time, significantly improving its refrigeration capacity.

[0068] In another optional embodiment, a first branch 520 is provided at a position corresponding to the main line 510 and each immersion shell 400, a main line valve body 511 is provided at a position corresponding to each first branch 520 on the main line 510, and a first valve body 521 is provided on each first branch 520. The first branch 520 is used to cooperate with the main line valve body 511 to bypass the main line 510 at one end corresponding to the current immersion shell 400, and the first branch 520 does not exchange heat with the current immersion shell 400 to which it corresponds. Through the above arrangement, the condensing device 500 can achieve selective cooling of the immersion shell 400 and / or the phase change shell 700, thereby saving the temperature control cost. For example, if the temperature of the battery unit 600 in the current corresponding immersion shell 400 is low, and the temperature of the battery unit 600 below is high, and temperature control is required, the main line valve body 511 on the main line 510 corresponding to the current immersion shell 400 is closed, and the first valve body 521 on the first branch line 520 corresponding to the current immersion shell 400 is opened, and the main line valve body 511 on the main line 510 corresponding to the immersion shell 400 below is opened, and the first valve body 521 on the first branch line 520 corresponding to the current immersion shell 400 is closed, so that the condensing device 500 does not condense the current immersion shell 400. Heat exchange, targeted heat exchange for the lower side of the immersion shell 400, effectively saving condensation resources and reducing temperature control costs. In addition, it can also ensure that all battery cells 600 in the energy storage container are within a reasonable operating temperature range, avoiding the phenomenon of too low or too high temperature, and ensuring the working stability of the battery cell 600. If the battery cell 600 in the current corresponding immersion shell 400 is heated to a certain degree, but does not need to be significantly cooled and controlled, the corresponding second valve body 534 can be opened, and the second branch 530 can be used for cooling and heat exchange. The main valve body 511 is arranged between the intersection of the first branch 520 and the second branch 530 corresponding to it and the intersection of the liquid inlet side and the liquid outlet side of the main line 510. Regarding the first branch 520 not exchanging heat with the immersion shell 400, it can be achieved by setting a corresponding heat insulation material on it, which will not be repeated here. In addition, the corresponding plate shells on the outside of the main line 510 and the first branch 520 can refer to the existing technology and will not be limited here.

[0069] As one of the preferred embodiments, a water collecting device is provided on the upper side of the bevel portion 420 or the bevel portion 420 and the battery portion 410 , and the water collecting device is used to collect condensed water on the condensation device 500 and allow the condensed water to flow at least over the upper surface of the bevel portion 420 . Since the temperature of the condensing device 500 is usually low, condensed water is easily formed on its surface. In the energy storage container, condensed water is also a problem that is difficult to deal with. The usual treatment method is to collect and discharge it. Since the condensed water is generated on the surface of the condensing device 500 and its temperature is relatively low, directly discharging it will cause a waste of refrigeration capacity. In this embodiment, the condensed water is caused to flow through the upper surface of the bevel portion 420 through the setting of the water collecting device. Since the upper plate of the bevel portion 420 is inclined, the steam generated inside the immersion shell 400 rises along the inner surface of the upper plate of the bevel portion 420, so that the upper plate of the bevel portion 420 becomes a heat exchange structure between the condensed water and the steam of the immersion liquid 430, so that the condensed water is used to cool the steam. On the one hand, the refrigeration capacity is fully utilized and the refrigeration efficiency is improved. On the other hand, the condensation capacity is increased and the condensation efficiency of the immersion liquid 430 is improved.

[0070] In this embodiment, the water collecting device includes a side baffle 421, a lower baffle 423, a water collecting trough 424 and a drainage hole 425. There are two side baffles 421, which are respectively arranged on the front and rear sides of the upper surface of the oblique body 420. One end of the side baffle 421 is arranged in contact with the condensing device 500, and the other end is connected to the lower baffle 423. The lower baffle 423 is arranged at a position close to the connection between the battery part 410 and the oblique body 420. The water collecting trough 424 is arranged on the side of the lower baffle 423 facing the condensing device 500, and the water collecting trough 424 is arranged at a position close to the lower baffle 423. The drainage hole 425 is arranged at one end of the water collecting trough 424, which is used to transport the collected condensed water to the condensed water collection structure in the energy storage container. The side baffle 421 can prevent the condensed water from flowing disorderly from the front or rear side, and the lower baffle 423 is used to stop the condensed water so that it can be collected in the water collecting trough 424 and then discharged through the drainage hole 425. The specific structure of the condensate collection structure is no longer within the scope of improvement of the present application, and reference may be made to the prior art, so it will not be described in detail here. Preferably, the drain hole 425 is connected to a drain pipe, and the drain pipe seal is arranged through the immersion shell 400. This arrangement enables the condensate to still exchange heat with the immersion liquid 430 during the discharge process, thereby effectively improving the refrigeration efficiency. Among them, the lower baffle 423 is arranged on the bevel portion 420 and / or the battery portion 410. Preferably, the water collecting tank 424 gradually decreases from the end away from the drain hole 425 to the end close to the drain hole 425. This arrangement helps to improve the fluidity of the condensate to prevent it from staying in the water collecting tank 424 for a long time.

[0071] Preferably, the water collecting device further comprises a plurality of baffles 422 staggeredly arranged on the upper surface of the oblique body 420, and the baffles 422 are used to form a zigzag flow channel for condensed water. One end of some baffles 422 is connected to the side baffle 421 located at the front side, and the other end extends to the side baffle 421 located at the rear side, and one end of another baffle 422 is connected to the side baffle 421 located at the rear side, and the other end extends to the side baffle 421 located at the front side, thereby forming a zigzag flow channel. This arrangement can effectively increase the flow time of condensed water on the upper surface of the oblique body 420, thereby extending the heat exchange time between the condensed water and the steam on the inner surface of the upper plate of the oblique body 420, so that the condensed water can fully exchange heat, thereby improving the refrigeration efficiency of the energy storage container.

[0072] As one of the optional embodiments, Figure 4 As shown, the retaining rib 422 is inclined downward during the extension process. Preferably, the left angle between the retaining rib 422 and the side baffle 421 connected thereto is between 85° and 88°. The inclined setting of the retaining rib 422 enables the condensed water to gradually flow downward along the surface of the retaining rib 422, thereby avoiding the formation of water accumulation on the retaining rib 422 and ensuring the fluidity of the condensed water. The above angle setting extends the flow path of the condensed water while ensuring the fluidity of the condensed water, thereby improving the heat exchange effect.

[0073] As one of the preferred examples, the angle between the bevel portion 420 and the horizontal direction is 25°-35°. Preferably, the angle between the bevel portion 420 and the horizontal direction is 30°. When the angle is within the above range, the liquid that can be added to the temperature control device and its overall height can achieve a better matching state.

[0074] As an embodiment of the present invention, the melting point M of the phase change material 710 is lower than the boiling point T of the immersion liquid 430. During the melting process of the phase change material 710, it is in a state of a solid-liquid mixture, and the temperature is fixed at its melting point. Since the cross-section of the phase change housing 700 is triangular, part of the liquid of the melted phase change material 710 always contacts the upper inclined plate, so that it can always maintain a heat exchange state with the immersion liquid 430, thereby effectively delaying its boiling time.

[0075] In this embodiment, the boiling point T of the immersion liquid 430 is between 30°C and 40°C, and the melting point of the phase change material 710 is between 25°C and 35°C. The operating temperature range of the battery is generally below 50°C, and the preferred operating temperature is between 20°C and 40°C. The boiling point of the immersion liquid 430 is limited to 30°C to 40°C so that it can continue to evaporate during the operation of the battery, and even if it reaches boiling, it is kept at a more reasonable temperature, which can effectively avoid the phenomenon of thermal runaway of the battery and ensure its working safety. The melting point of the phase change material 710 is set between 25°C and 35°C so that it can significantly delay the boiling time of the immersion liquid 430, thereby saving refrigeration energy consumption.

[0076] Preferably, the immersion liquid 430 is DA-324, and the phase change material 710 is n-octadecane. The boiling point of DA-324 is 34.2°C, and when it boils, it can also ensure that the battery is in a better operating temperature range. The melting point of n-octadecane is 28.18°C, and it can melt and absorb heat before the immersion liquid 430 boils, thereby effectively delaying its boiling time and reducing the number and time of opening the refrigeration device 300. It should be understood that the immersion liquid 430 can also be other fluorinated liquids or composite immersion solutions, and the phase change material 710 is paraffin or other composite phase change materials, which are no longer limited here.

[0077] Preferably, the ratio of the depth of the immersion liquid 430 to the height of the battery cell 600 is 0.8 to 1.2. This configuration allows most of the battery cell 600 to be immersed in the immersion liquid 430, achieving uniform temperature control of the battery cell 600 and reducing the phenomenon of local over-temperature.

[0078] Example 2

[0079] This embodiment discloses a temperature control method for controlling the temperature control device of the battery unit as described in Embodiment 1.

[0080] The control method comprises:

[0081] Step S1: Detecting the temperature T of all battery cells 600 in the energy storage container i ;

[0082] Step S2: Set T i Respectively with the first preset temperature T 1 Compare, when there is more than one T i >T 1 When the refrigeration device 300 in the energy storage container is started to provide condensate for the condensing device 500;

[0083] Step S3: According to T i With the first preset temperature T 1 The comparison result is that when T i>T 1 When T i ≤T 1 When , execute step S9;

[0084] Step S4: Set T i and the second preset temperature T 2 Compare, when T i >T 2 , the corresponding battery unit 600 and / or immersion shell 400 is recorded as the first cooling group, and step S5 is executed. i ≤T 2 When the corresponding battery unit 600 and / or immersion shell 400 is recorded as the second cooling group, and step S7 is executed;

[0085] Step S5: Open the main valve body 511 and the second valve body 534 corresponding to the battery unit 600 and / or the immersion shell 400 in the first cooling group, close the first valve body 521, and then execute step S6;

[0086] Step S6: Real-time monitoring of the temperature of the battery cells 600 in each immersed shell 400 in the first cooling group, when the temperature drops to T 1 When the temperature reaches 0, it is recorded in the second cooling group and step S7 is executed;

[0087] Step S7: Open the main valve body 511 corresponding to the battery unit 600 and / or the immersion shell 400 in the second cooling group, close the first valve body 521 and the second valve body 534, and then execute step S8;

[0088] Step S8: Real-time monitoring of the temperature of the battery cells 600 in each immersion shell 400 in the second cooling group. When the temperature drops to the boiling point T of the immersion liquid 430, it is recorded in the third cooling group and step S10 is executed; when the temperature rises to T 2 When the temperature reaches 0, it is recorded in the first cooling group and step S5 is executed;

[0089] Step S9: Set T i Compared with the boiling temperature T of the immersion liquid 430, when T i >T, the corresponding battery unit 600 and / or immersion shell 400 is recorded as the third cooling group, and step S10 is executed. i ≤T, the corresponding battery unit 600 and / or immersion shell 400 is recorded as a non-cooling group, and step S12 is executed;

[0090] Step S10: Open the second valve body 534 corresponding to the battery unit 600 and / or the immersion shell 400 in the third cooling group, close the main valve body 511 and the first valve body 521, and then execute step S11;

[0091] Step S11: Real-time monitoring of the temperature of the battery cells 600 in each immersion shell 400 in the third cooling group, when the temperature drops to the third preset temperature T 3 When the temperature rises to the first preset temperature T 1 When the temperature reaches 0, it is recorded in the second cooling group and step S8 is executed;

[0092] Step S12: Open the first valve body 521 corresponding to the battery unit 600 and / or the immersion shell 400 in the non-cooling group, close the main valve body 511 and the second valve body 534, and then execute step S13;

[0093] Step S13: monitor the temperature of the battery cells 600 in each immersion shell 400 in the third cooling group in real time. When the temperature reaches the boiling point T of the immersion liquid 430, record it in the third cooling group and execute step S10.

[0094] Wherein, i is the serial number of the battery unit 600 and / or the immersion shell 400 in the energy storage container, and the first preset temperature T 1 , the second preset temperature T 2 and the third preset temperature T 3 is the preset value, T 2 >T 1 >T>T 3 .

[0095] Through the above settings, the hierarchical control of battery temperature is achieved, and because the switching temperatures of each cooling group are different, the frequent switching of the valve body is avoided, ensuring the stability of system operation. i >T 2 When , it indicates that the temperature of the battery cell 600 is much higher than the boiling point temperature T of the immersion liquid 430. At this time, the immersion liquid 430 in the immersion shell 400 is basically completely vaporized, and its own vaporization heat absorption can no longer effectively control the temperature of the battery cell 600. At this time, the main valve body 511 and the second valve body 534 are opened, and the first valve body 521 is closed to maximize the condensation of the immersion liquid 430, thereby quickly controlling the temperature of the battery cell 600 to drop to an appropriate temperature range; when T 1 <T i ≤T 2 When T<T i ≤T 1When the temperature of the battery cell 600 is higher than that of the immersion liquid 430, the immersion liquid 430 is in a boiling and rapid evaporation stage. At this time, the second branch 530 can be used for cooling. When the temperature of the battery cell 600 can be stabilized within a certain range, less condensate can be used to achieve effective temperature control, thereby effectively reducing the temperature control cost. When the temperature T of the battery cell 600 is i When ≤T, it indicates that the immersion liquid 430 is in a non-boiling or near-boiling state. At this time, the immersion liquid 430 can provide a large amount of evaporation heat, so there is no need to perform condensation operation on it.

[0096] As one of the optional embodiments, the first preset temperature T 1 The second preset temperature T2 is 4-5°C higher than the boiling point of the immersion liquid 430, the second preset temperature T2 is 6-8°C higher than the boiling point of the immersion liquid 430, and the third preset temperature T 3 2-3°C lower than the boiling point of the immersion liquid 430. Generally, the temperature difference between the battery cell 600 and the immersion liquid 430 is 2-3°C, and the temperature of the battery cell 600 is higher than the temperature of the immersion liquid 430. i >T 2 When T 1 <T i ≤T 2 When T<T i ≤T 1 When T is 0, it indicates that the immersion liquid 430 is in the boiling and rapid evaporation stage, and can be cooled through the second branch 530, which can effectively prolong its evaporation time. i ≤T, indicating that the immersion liquid 430 is in a non-boiling or near-boiling state, and may even be lower than the melting point of the phase change material 710, thereby effectively extending its boiling time and controlling the temperature of the battery cell 600 within a reasonable range. At this time, there is no need to perform corresponding condensation operations.

[0097] It should be noted that when it is monitored that the temperature of the battery cell 600 in the first cooling group continues to rise, the cooling power of the refrigeration device 300 is increased, and the cooling power is adjusted according to the temperature change until the temperature drops. When the cooling power of the refrigeration device 300 reaches the maximum and the temperature of the battery cell 600 continues to rise, the temperature control device issues an alarm and stops the battery cell 600 or isolates it if necessary.

[0098] Example 3

[0099] This embodiment provides an energy storage container, including the temperature control device as described in Example 1, the energy storage container includes a box body 100, a plurality of racks 200 are arranged in the box body 100, a plurality of support plates 210 are arranged in the height direction of the racks 200, the temperature control device is arranged on the support plates 210, and a refrigeration device 300 is also arranged in the box body 100, the refrigeration device 300 is connected to the condensing device 500, and is used to transport condensate to the condensing device 500, and the condensate is water or other refrigerant, which is not limited here.

[0100] The energy storage container includes other conventional components such as PCS, and the details can be referred to the prior art and will not be described here.

[0101] Although the present invention is disclosed as above, the present invention is not limited thereto. In the description of this specification, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A temperature control device for a battery unit, wherein the battery unit is used in an energy storage container, characterized in that: include: An immersion shell (400) comprises a battery portion (410) and an oblique portion (420), wherein a first chamber is provided inside the battery portion (410), the oblique portion (420) is arranged on one side of the battery portion (410), the oblique portion (420) gradually tilts upward in a direction away from the battery portion (410), and a second chamber is provided inside the oblique portion (420), the second chamber being in communication with the first chamber; A battery unit (600) is disposed in the first chamber; An immersion liquid (430) is disposed in the first chamber and the second chamber, wherein the immersion liquid (430) immerses at least half of the battery unit (600) in a height direction; A phase change shell (700), wherein the cross section of the phase change shell (700) is triangular, the upper inclined plate of the phase change shell is arranged in close contact with the lower plate of the inclined body portion (420), and a phase change material (710) is arranged in the phase change shell (700); The condensation device (500) is arranged on a side of the oblique body (420) away from the battery part (410). The condensation device (500) is arranged in close contact with the oblique body (420) and the phase change housing (700) and is used to cool and condense the evaporated immersion liquid (430) and / or cool the phase change material (710).

2. The temperature control device of the battery unit according to claim 1, characterized in that: The condensing device (500) comprises a main line (510), a second branch line (530) is arranged at a position corresponding to the main line (510) and each immersion shell (400), the second branch line (530) passes through the phase change shell (700) and is connected to the main line (510), and a second valve body (534) is arranged on each second branch line (530).

3. The temperature control device of the battery unit according to claim 2, characterized in that: The second branch (530) comprises a liquid inlet pipe (531), a liquid outlet pipe (532) and a phase change inner coil (533); the second valve body (534) is arranged on the liquid inlet pipe (531); and the phase change inner coil (533) is arranged inside the phase change housing (700).

4. The temperature control device of the battery unit according to claim 3, characterized in that: The phase change inner coil (533) is arranged at a position close to the upper inclined plate of the phase change housing (700).

5. The temperature control device of the battery unit according to claim 2, characterized in that: A first branch (520) is arranged at a position of the main line (510) corresponding to each immersion shell (400), a main line valve body (511) is arranged at a position of the main line (510) corresponding to each first branch (520), and a first valve body (521) is arranged on each first branch (520).

6. The temperature control device of the battery unit according to claim 1, characterized in that: A water collecting device is provided on the upper side of the oblique body (420) or the oblique body (420) and the battery part (410), and the water collecting device is used to collect condensed water on the condensing device (500) and allow the condensed water to flow at least over the upper surface of the oblique body (420).

7. The temperature control device of the battery unit according to claim 1, characterized in that: The melting point M of the phase change material (710) is lower than the boiling point T of the immersion liquid (430).

8. The temperature control device for a battery cell according to any one of claims 1 to 7, characterized in that: The boiling point T of the immersion liquid (430) is between 30°C and 40°C, and the melting point of the phase change material (710) is between 25°C and 35°C.

9. A temperature control method, used in the temperature control device according to any one of claims 1 to 8, characterized in that: The control method comprises: Step S1: Detecting the temperature T of all battery cells (600) in the energy storage container i ; Step S2: Set T i are compared with the first preset temperature T1 respectively. i >When T1, the refrigeration device (300) in the energy storage container is started to provide condensate for the condensing device (500); Step S3: According to T i Compared with the first preset temperature T1, when T i >T1, execute step S4; when T i ≤T1, execute step S9; Step S4: Set T i Compared with the second preset temperature T2, when T i >T2, the corresponding battery unit (600) and / or immersion shell (400) is recorded as the first cooling group, and step S5 is executed. When T i ≤T2, the corresponding battery unit (600) and / or the immersion shell (400) is recorded as a second cooling group, and step S7 is executed; Step S5: opening the main valve body (511) and the second valve body (534) corresponding to the battery unit (600) and / or the immersion shell (400) in the first cooling group, closing the first valve body (521), and then executing step S6; Step S6: real-time monitoring of the temperature of the battery cells (600) in each immersed shell (400) in the first cooling group, when the temperature drops to T1, recording it in the second cooling group, and executing step S7; Step S7: opening the main valve body (511) corresponding to the battery unit (600) and / or the immersion shell (400) in the second cooling group, closing the first valve body (521) and the second valve body (534), and then executing step S8; Step S8: real-time monitoring of the temperature of the battery cells (600) in each immersion shell (400) in the second cooling group; when the temperature drops to the boiling point T of the immersion liquid (430), the temperature is recorded in the third cooling group and step S10 is executed; when the temperature rises to T2, the temperature is recorded in the first cooling group and step S5 is executed; Step S9: Set T i Compared with the boiling temperature T of the immersion liquid (430), when T i >T, the corresponding battery unit (600) and / or immersion shell (400) is recorded as the third cooling group, and step S10 is executed. When T i ≤T, the corresponding battery unit (600) and / or the immersed shell (400) is recorded as a non-cooling group, and step S12 is executed; Step S10: opening the second valve body (534) corresponding to the battery unit (600) and / or the immersion shell (400) in the third cooling group, closing the main valve body (511) and the first valve body (521), and then executing step S11; Step S11: real-time monitoring of the temperature of the battery cells (600) in each immersed shell (400) in the third cooling group; when the temperature drops to the third preset temperature T3, it is recorded in the non-cooling group and step S12 is executed; when the temperature rises to the first preset temperature T1, it is recorded in the second cooling group and step S8 is executed; Step S12: opening the first valve body (521) corresponding to the battery unit (600) and / or the immersed shell (400) in the non-cooling group, closing the main valve body (511) and the second valve body (534), and then executing step S13; Step S13: real-time monitoring of the temperature of the battery unit (600) in each immersion shell (400) in the third cooling group, when the temperature rises to the boiling point T of the immersion liquid (430), recording it in the third cooling group and executing step S10; Wherein, i is the serial number of the battery unit (600) and / or the immersion shell (400) in the energy storage container, the first preset temperature T1, the second preset temperature T2 and the third preset temperature T3 are preset values, T2>T1>T>T3.

10. An energy storage container, characterized in that: The device comprises a temperature control device as claimed in any one of claims 1 to 8.

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